S431 Back Cover Screws

[wordizlife]

Hello,

I have a new Lenovo S431 ultrabook and was about to upgrade the ram in it and a screw is stiped on the back panel.

I am going to replace them all with new stainless steel ones.

Could someone help me figure out what size is needed for the back cover. They seem to be very tiny Flat head socket cap screws.

I check on the Lenovo website without any luck.

Thanks!